These tube specifications are interpretations of pages copied from a Russian language tube
specification manual, sent to me by UR4LL, compared with specifications presented on various
sites on the www. An excellent Russian-English Technical glossary was compiled by G4PMY which
helps understand the Russian specifications sheets! I found agreement on most tubes (and
validated my "reading" of the Russian data). I also found one or two instances where the data
on the web was incorrect. Several web sites carry information about these tubes; those
I found with the most data are Tube Data Sheets,
DF6NA,
PE1OGF,
and Scientific Technical Centre NavigatoR.
Additionally, to get me started, UR4LL provided english notes on the initial data sheets.